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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cab95d6eb383c21a3fc4271e293cf59c255f7f7460dd41212abc83a046a2f32' 
  AND token = 'I64S1bSNoCrnN8IVIZuyg6F+Njf5KCgwsRLmSTugeoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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