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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49dc128aa4b907255123c9be3ea6c1426ed4f0ed7ceb0ee868d47a135e57b7a0' 
  AND token = 'dVLo1tHSmfH4sBBIvtLUkMmes76zQxzoeN4zy0qyhUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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