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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8086d4c1c25e09f34f4aa6912d9aa8a83147e2e08c6119445b3a6217fba93d87' 
  AND token = 'EAuT6ES0j2lQ8k1qEjDyVXD4esDwFfaZOHJKB7YiryQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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