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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeec69549784b486747510c0335c6c67ac2d3ce66262a3b80226b32b7449d6b4' 
  AND token = 'ySA5+cp4i9mOYEJ6I88nStU4G87YU7+gAdE2TRtnH5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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