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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8894a97c6551235797d22c2b2ae23790b5069dba9478b39d3154336dacf0315c' 
  AND token = 'oqnDmBNv/rnxaUmbZqXt0MwtdZyW3CzKqMpkTAc5VZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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