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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e47723bb62fdc284fb73b0c41c3d394e04a9018dcecec34af49d3723f0605a' 
  AND token = 'HIC0e77HqKyd2YD9FV9+DwTPlwDhvy7b5n2AR3ymlEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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