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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fba62235040dd81cd9122439f8450089c89d1955b542b672d662e4d25c01f2' 
  AND token = '219/FZ/Y1/Rn2f1k/4pWPOC21pTFO6M50AY5uUFvTlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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