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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9519ddd732e5d3d098aa29c6497d125ed1b1206b83bf40756751ec00cee61c' 
  AND token = 'kuWvsyyPxROeOWLB0gJbo3YXaaX4hYjBx3cFQz25db8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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