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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944f32e5f49a4dcd98e11715e6def75e3dd751f2b2d29b9b363708f0b395c93a' 
  AND token = 'sdfLA1wUx3aofOaFeJvmt4haIwqfPPO0eZgvgodr1iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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