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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1674c235cc46db731a5944bc4f85b0eaa0bd9434b866f62b20f496a27153a18' 
  AND token = 'NWugX8zcbq6rUXZUXjS7Io8IGg5kS4vl4/TPm2CzXW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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