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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f94a5b11bb62ab75498877393f6a68a2c5bd76d3d79d2bbdfd8e087835b2e8f' 
  AND token = 'n53K46cAEQS/A2dabZcZVxlKA1mVAx1OlnKRmLvQrmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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