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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9402d63cae1035f41e840434e569d1499fcf2047271e1d4e01948e9726ba7c' 
  AND token = 'R6/FFf4FeVZKOwTjX8FkAJ8FVDyJNRikT+EVDY9pnA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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