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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae27ed2fd14850e5fa3aa868ab30d39d6e841b42a25a183f90856e1458d00892' 
  AND token = 'QeWjdwROsBB0ANS4SJWmOtcbf2aYqPVfZfdNTfJscuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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