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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b64967121031f8dead7966811311c521fbeb6507d36ee43656aefe7825078d' 
  AND token = '8HGb3jMVQ0fu9rdGR48ldv+OG5WyBzQ5Q2nWMdeIXRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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