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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da881c782c06e45e5c73427e3ecd00fe2431c11bae534944768b5901af2518e5' 
  AND token = 'VQSNHE2SY592HdfS1XKl/wT1gMHIDQT8J+Uvfx3W108=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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