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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc54cbfe78ceac2400b583a0bcc2656b17384c8d10f80fd012b19bc4dda3954' 
  AND token = 'OG0geK+36tkqNAieQ/Srcpi2QlR4SSBxIXJPJPN5DNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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