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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af7a75d27833009467992e9ce2300f547eabaca872fe5464f2f0b98055c1392' 
  AND token = 'wWdFN2GLCsUoyK845rKN50/u9ThWasBggEFS8gGM6TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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