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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ceb84358c03cceee3753bd883e757da1e479701bed5385d4cb848336ac49a2' 
  AND token = 'tf6UCAm8LMxNbff0uzRunrlj9C6mdMoydSFtdz4TNgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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