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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908e73e2a61b90b649efe3a4a8e3509669135eb35bbeb6988b0a52ded77a906b' 
  AND token = 'Z+BSla/X7GFMRnILnL8iuNnKUPTuOnzKipg+d5uPyWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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