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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37f9d4b3cd515076d70273cfc4c4c189af233975dabc3f24bd242bbef917b8e' 
  AND token = 'iw4DNLxoAU0NIf51HkARAtWPN3cEo2ikbekbXg7dx54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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