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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1428c97079e5f5616a3f80cac53449c985808f230a5cf26f37d2c8139fd31f' 
  AND token = 'lMfEQBUM37joU8zsS62hfLh1YiqkL1PL3RpEBfyBCDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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