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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48a7426c66af730341733f80806bee4b2e3a74e04e0ac656d2e629b51228b97' 
  AND token = 'lmN2kOlZvsHfdAx9DqSmOrokaJgTK3559WeBl2dHXeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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