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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22bf2c804e74bf802970c076c6d29f38ce4ca6797af0b36f0c34dc64d70622be' 
  AND token = '3ujH5/eBPo6wLL7ZwAkqZG8KrL1qxEJWpemd73UkAGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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