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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6345db515394eb266c4380e51620f541ab3262d747a46049aa8eb98d30891a' 
  AND token = '07HsyUIqCY4b75yuO6fgqStWNQ/mgT+PgyxRyIBWibM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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