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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2e2c165e19fb91be1e83224e4178f8edc20e00c9eb5bca079a9840d21428ae' 
  AND token = 'ndjYwdFl8Mbi5hXt7t9lwHog2vAiiI/RDHEvpoqYtoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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