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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee101e9373eecfee9bc76fa337b0b3a5e9ba798cc85ad9f64561a107b5449fa' 
  AND token = 'fP7hL9fWJ5zTkbf4vmUxN1Kh9qKjs23+JEiufU1f4pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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