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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39b13785c8c9aefa0672ef02e86da000a32d9992195549246ebdc4e43c02c75' 
  AND token = '2DE+mapU+fWZAMK7ldP3krfVi0z3j0EOoJnSpUvwDMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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