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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1152ffe80c9b47c40a1a251b684951e85a05e6a5e8c36b0bb8d98863805026' 
  AND token = 'yWkkfODnUsKhtSKNH5y0WQPcrD7+3YMhHEq1Hkcsfy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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