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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938633d4ba03c19251dc83ff55e46cab25ccc3ff1175810d5b877a3389f6f8f8' 
  AND token = 'pkqk19PPL0S1M8GKYFKMpNu9gI1/B79TXtkiP0GRFcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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