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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a695d3dcb9763dc8fc6aab312f9092e19ab1089b4792333bb47cd6bb60200390' 
  AND token = 'ia0BX7i2HiFbdo18v6EMZjSUlywKRZ1K50g45J+B/NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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