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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48d62036efd70ad3a0adc846abcbd783dfa61def466eef7138edd4c2d45d7c8' 
  AND token = '4JW6O7f1SFyMn53OPh9dzcRZ/DG05+8GhUjoYbqxy3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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