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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5630c2dd9f066a1e71ea609ebce1e589788382dc1bd83e16868b01b8de2fb82' 
  AND token = 'YxNW0qSVuyNwdmuLv/Lnk6G9sZoYWxLEIR1F1mP2fDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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