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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59cfd990ed91299fb0c4e9fdeb28187d0f05e1f03040c06965ea5b3b60a4006' 
  AND token = 'Mr+k6iMI+VoVtZlEE5arZchyY+p9KeohoGmYkARP8yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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