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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4d89373d6c00ce349ecd6a7c66cf5ad1db8e3e561717e0b57415f366b14040' 
  AND token = '54Gzsdy1xe1Dip0IN3JXxEoed157eVPoFihms3zXolY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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