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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b5251a22c20ec057d2aeaa70c54ec368169f6418af92491b6495971025244c' 
  AND token = 'oGwLQASCB2Jj4hqGM2sHxzFJPNpJSc7COHIZbi/cIv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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