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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f07509b5599aabad3eaf8103903f5e3566a2c7786fd50601d0140b0aefbb1b9' 
  AND token = 'UwZ47ihfNiV/axZOgo3UgFy+oxmWc++JME9iXii3t4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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