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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14902b2a53e55b6e5cc518b3184d00aaf6f1d8173cd7c922f7517dc86002e5a5' 
  AND token = '0wkaLyMwvdkgU8v7T2iMD0Gz+CPoL3ULh/Ww0Kx3FBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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