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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe4c77660d508be5d8dbd3c6c0d472622d0dc254f6420c4c6a7f704d357f231' 
  AND token = 'BfIjzvZo+bvUt4JTrkWZ8oG0DP7xVq+q1KEV4GF0j80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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