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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95723ef30d2868273e77fe457490cd0b884d9a927be4c6cdaaf60a100a430f9' 
  AND token = 'secjTJmhTqmPzoqO+d689kTTm7UoXk8PuS+SKOmYmvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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