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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e986c1eaba1a036cd037607e7cdc4c8274f15983a25124d725cae1cd1ba073' 
  AND token = 'vYjLu9OeF8wjpIP99a9FarDG+9AqINF8qY9aMr50BQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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