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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73b8119564ecbd88925f5c7fb57aefc10c5bcf1ce072c8831b0e161a353c1bd' 
  AND token = 'HbPpPSM2oTpFDgGy+It29DAi6HWt9y61fhRvOrJeqzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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