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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252a1e8e28b7c531bdbd86051bea84c98c9554a0074cecd4bedf528d091ae2ad' 
  AND token = 'Z7WP9+s75fyG95VSs6W896pS9GXQZfcCER+kGi3Lovs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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