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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8226b5c6be4c336785427ce78940828387105da5e9105438cd9f6257ae7e547' 
  AND token = 'rpA6s0RUboy2kOlnkBp8IXVPsT0ki+6+1WysbnmP3M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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