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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd771b7935e3aeb2a4d39d4c382f5a88c15505ec24768811435425b1afa68d072' 
  AND token = 'wYKnpHTsseFE/5Q5/2U9DF03vQZCW4vA863q47qPYJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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