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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57f741c7bc09403ffe9e9e3e787e24bc483f8ab36d6280bb62249022bb95c09' 
  AND token = 'vEfVkO6UR31ItEOki8qY1POJ6UF6/dq6kMX7IEtsM7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}