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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0981d09443ce6b85b7da1927ab1153648db5957b0737a1f5acc5c4c806bcbc8' 
  AND token = '/eQWWIeRrteMV8MLXuv8KZfA8ht5GsGT64BEFNZVv30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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