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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bb947dd01f1ef6a912d07acc0486b2640d8683b0f2dd794bcf8ba3dfb6ff99' 
  AND token = 'emIdy69JpirAfAmfawzQ/4A8rJCZ2glf+Gbsb/2ok6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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