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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cc3b7a4d539b61b2707521f4dc0e9e4c7ea97be1b2ec8f694e15e57d164935' 
  AND token = 'oDHpYHBmFlqDetERsv6iHvOJHuJ4w+1Sq6ucv4pigGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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