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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b848736caa0f0412514884d87bf664ffa13a08531a8f1e6f0f329916e752cb5' 
  AND token = 'ow9+AejQaXxcMS3AiWt+AJQ63oIfqtErVB6o00sENHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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