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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0a25fe1f4815ac565b9550e6b248f1b238447f64b0eec782592e43afaac86a' 
  AND token = 'Gg4sYCW//VGQszJsY8i78b1bmKMBex1kSnG5lcPou9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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