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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95e242241390c41417a0239c20bf2e67bade712ee569a8686fba2ebf9e6644c' 
  AND token = 'Pcx2hKls1FA6zajxZSLxdm3tASFFvctP8HhUf++n+1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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