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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3527b2dcba98f077d720ccb7556105026fc27619102b06ccf9df12eaeee0553e' 
  AND token = 'Zn+IjDh3poEIKvoAsGRKtSCoeS5Zd56d9dEHNdYYqRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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