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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bef2974ace8649166a283170cfc61ea9e385e263158f9f539def366f329eb8' 
  AND token = 'zypIKc12CO0di2IAtPCb8JBpHBxi+2+Fq5EQI/2l4Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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