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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab9b4fd09a49b5729bbe91bf2570148d2928c5317ca9d7c2b07ec6003b6e8a3' 
  AND token = 'LY2gb3d2wcmL4WgFw3NIbZhIs0rWH6Op13XoB3Xx0ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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